This is how you would find available appointment slots in openemr.
Go to calendar, click on any time slot or click on the plus sign above the month calendar on the left column, once the appointment dialogue opens, scroll down and click on the “Find Available”.
Remember that for this to work, you need to select your desired office hours in the calendar:
Hello @Rakesh
I do not know of any report from the main menu Report item, that will show a provider’s available calendar time slots. The only way I know of to see those is when making an appointment the button at the bottom of the event dialog, as shown in the ‘making appointments’ section of the page: page linked above